the impact of gaia on our knowledge of stars and their planets · 2017. 10. 11. · know thy star...
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Know thy star know thy planet conference pasadena, 11/10/2017
The Impact of Gaia on Our Knowledge of
Stars and Their Planets
A. Sozzetti INAF – Osservatorio Astrofisico di Torino
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The impact of Gaia on our knowledge of stars and their planets has been inexistent.
So far.
This is bound to change very soon.
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A Space Astrometry Revolution!
At Gaia’s G=20.7 survey limit: >1x109 stars
µas astrometry comes of age...
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• Launch 19 December 2013 with Soyuz from Kourou (French Guyana) • Gaia in routine operations at L2 since July 2014 • 1,000 days routine phase reached 20 April 2017 • Operations: nominal • some 87 billion transits observed • Bright limit around G=3 mag • Very bright stars treated separately • Nominal 5-year mission ends mid-2019
How is Gaia doing?
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Know thy star know thy planet conference pasadena, 11/10/2017
Gaia DR1
Brown et al. 2016
Limitations of TGAS
>200 papers based on Gaia DR1 since 2016-09-14
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Handling ‘Issues’ • Contamination
• Last decontamination in August 2016; no sign of transmission loss yet
• Micro-clanks and micrometeoroids
• Taken into account in data processing for Gaia DR2 • Basic Angle Variation
• Corrected with Basic Angle Monitor data for Gaia DR1 and DR2; more sophisticated analysis planned for the future
• Stray light
• Impact on faint sources; on-board software modified from read-out dominated to background dominated case for faint objects
• Radiation damage
• First signs visible, but less than anticipated before launch; pre-launch calibration work will become relevant in the future
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Gaia DR2: April 2018
* Five-parameter astrometric solutions for all sources with acceptable formal standard errors (> 109 anticipated), and positions (α;δ) for sources for which parallaxes and proper motions cannot be derived (ALL Gaia-only) * G and integrated GBP and GRP photometric fluxes and magnitudes for all sources * Median radial velocities for sources brighter than GRVS = 12 * For stars with G < 17, estimates of Teff and when possible (π>0!) AG & E[BP-RP] based on integrated photometry, Mbol and R* when σ(π) < 20% * Photometric data for a sample of variable stars * Epoch astrometry for a pre-selected list of > 10 000 asteroids
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● Parallaxes: - a factor of several (I hope!) better than DR1
GDR2: more and better data
Courtesy C. Bailer-Jones
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After Gaia DR2 LESSON LEARNED: - Complex interfaces between DPAC elements
- Need to produce catalogues providing scientifically significant steps forward
- This hampers the possibility to have DRs on a yearly basis
THEREFORE:
- DR3 scheduled for 2020
- final DR in 2022 (three yrs after end of mission)
- See https://www.cosmos.esa.int/web/gaia/release
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Gaia Extension • Nominal mission end: mid-2019 • Likely end of mission: end-2023 ± 1 year • GST prepared with the help of many the science case for the ESA advisory bodies • Science case was prepared for a 5 years extension, but ESA extension cycle is 2+2 years so Gaia is in for the preliminary, scientific, extension approval for mid-2019-20 • End-2018 definitive extension for mid-2019-20 and preliminary scientific extension approval for 2021-22 • The extension decision is expected in Fall 2017
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CU4-NSS Timeline
- CU4-NSS handles astrometric, photometric and spectroscpic modeling of non single stars (including exoplanet orbits)
- It requires input of non-well-behaved stellar samples - CU3 to produce a first set based on the 5-parameters astrometric solution for DR2 - NSS are modeled based on highly calibrated data: not trivial! - First NSS processing results thus expected for DR3 (2020)
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The Impact of Gaia
- Gaia as a target selector - Gaia as a target characterizer - Gaia as a planet finder
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Populating the TIC/PIC
• Large-scale simulations (all-sky) produced by DPAC’s CU2 team (exercise, but you get the feeling)
• Simple cutoffs in G mag and d allow to limit ‘contaminants’ to within <1% (with ALL later than F5V stars identified)
• Can do even better (<0.1%) using Teff/logg info from onboard spectrophotometry and spectroscopy (logg not coming in DR2)
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Courtesy Jos de Brujine
Know what’s in thy pixels
Mind you: Independent of
magnitude of the primary
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Calibration of the Hosts Take Gaia parallaxes, and then do it your way!
Sozzetti & Damasso 2015 Stassun et al. 2017
DR2: Bright (V<13) F-G-K stars (D<200-300 pc) and not very faint (V<16) M dwarfs (D<50-60 pc) might have distances determined to a few %
Derive ‘accurate’ stellar radii to within 5% or so
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Gaia Discovery Space Unbiased,
magnitude-limited planet census of
maybe 106-107 stars
On the order of >104 NEW gas giants (< 15 MJUP) around A through M dwarfs
Numbers might as much as triple
for a 10-yr mission
Lattanzi et al. 2000, Sozzetti et al.2001 Casertano et al. 2008 Perryman et al. 2014 Sozzetti et al. 2014 Sahlmann et al. 2014
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The Gaia Legacy
Gaia will test the fine structure of GP parameters distributions and frequencies (including the GP/BD transition), and investigate their changes as a function of stellar mass, metallicity, age, and multiplicity with unprecedented resolution
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M*: Frequencies
Today: 102 stars in a bin! Gaia: 104 stars in a bin!
Johnson et al. 2010 Reffert et al. 2015
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M*: Correlations
- Are more massive planets preferentially found around more massive primaries? - Do lower- and higher-mass star only host longer-period companions?
Gaia will allow you to answer with 10x more planets!
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[Fe/H]: Frequencies
Today: 102 stars in a bin! Gaia: 104 stars in a bin!
Sozzetti et al. 2009 Mortier, Santos, Sozzetti et al. 2012, Mortier et al. 2012
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[Fe/H]: Correlations
Sozzetti 2004 Thorngren et al. 2016
- Are more massive planets preferentially found around low-[Fe/H] primaries? - Do low-[Fe/H] stars host longer-period companions? - What is the actual [Fe/H] limit for giant planet formation?
Gaia will allow you to answer with 10x more planets!
Santos et al. 2017 Mulders et al. 2016
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ηE and Solar System analogs
A 10-yr Gaia mission could provide a census of > 1 MJup analogs around most of TESS and PLATO targets (planet hosts and not)
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Unique exploration of the GP/BD transition region of companions to 1000s of young stars in a regime of separations mostly inaccesible to DI
Gaia and Young Stars
Courtesy E. Mamajek
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Gaia & Post-MS Stars
D<100 pc D<200 pc
R<13 50 400
R<14 200 1600
R<15 800 6400
Good to within a factor 2…
Gaia will perform THE observational test of theoretical predictions related to: A) post-MS planet evolution & B) 2nd generation planet formation
Silvotti, Sozzetti, & Lattanzi, 2015
White dwarfs in the solar neighborhood
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Gaia & UCD Planets
- Found so far only in microlensing events - Gaia will see ~1000 UCDs of all ages, with sufficient astrometric sensitivity to giant planets within 2-3 AU - A fundamental test of planet formation!
Gaia detection limits for Luhman 16 AB (Boffin et al. 2014)
Sozzetti (arXiv:1406.1388)
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Gaia & Multiple Systems >50% of 1-GP systems has additional massive companions
Bryan et al. 2016
• Combine Perryman et al. (2014) and Casertano et al. (2008) results: • Tmission= 5 yr: >2500 two-planet systems with σ(M)<15%-20%, some 250 Irel measurements • Tmission= 10 yr: >6000 two-planet systems with σ(M)<15%-20%, some 600 Irel measurements
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Know thy star know thy planet conference pasadena, 11/10/2017
Gaia and Planets in Binaries
Ngo et al. 2017, but see Moutou et al. 2017
- Are orbital elements distribution of planets in binaries and around single stars the same? - Are the orbital architectures of giant planet systems in binaries the same as those of planets around single stars? - How do frequencies depend on binary separation? - What about all these questions in the circumbinary case?
Gaia is sensitive to giant planets around >106 stars: > 50% will be binaries!
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Know thy star know thy planet conference pasadena, 11/10/2017
Gaia, Stars, and Exoplanets
The impact of Gaia on our knowledge of stars and the planets they host:
- Critical for clean target sample selection
- Crucial for accurate determination of stellar properties
- Diversified across orders of magnitude in mass and separation of companions, encompassing all ranges of
stellar mass, chemical composition, age, multiplicity
Multi-faceted and far-reaching, i.e. revolutionary!
Gaia to start delivering in the field in April 2018. Stay tuned!